37 CFR 3.61: Domestic representative.

If the assignee of a patent, patent application, trademark application or trademark registration is not domiciled in the United States, the assignee may designate a domestic representative in a document filed in the United States Patent and Trademark Office. The designation should state the name and address of a person residing within the United States on whom may be served process or notice of proceedings affecting the application, patent or registration or rights thereunder.